#include <stdio.h>
#define PRINT_INT(n) printf("%d\n", n)
#define DOUBLE(x) 2*x
#define DOUBLE2(x) (2*(x))
int main(void)
{
    PRINT_INT(DOUBLE(1+2)); /* 2*1+2 = 4 */
    PRINT_INT(DOUBLE2(1+2));
    PRINT_INT(4/DOUBLE(2)); /* 4/2*2 = 4 */
    PRINT_INT(4/DOUBLE2(2));
    return 0;
}